Table 1. Everyday use criteria.
| Criteria | Definition | Description |
|---|---|---|
| 1. Ease of setupc | Deals with the amount of effort invested to start using the device | Includes items such as pairing with mobile device, account setup, and finding the app from the app store |
| 2. Ease of use for device controlsa* | Deals with effort needed to use the physical device controls | Includes the comfort of using the controls, ease of accessing different screens using control buttons, and ease of navigating on the wearable device |
| 3. Wearable display viewabilitya | Deals with the overall viewability of the wearable display | Includes simplicity of the display, size of the text or infographics, clarity with which data is displayed on the wearable device, and visibility of display under different light conditions |
| 4. Wearable display interpretabilitya | Deals with cognitive load of interpreting the wearable display | Includes ease of accessing the different functions and data on the wearable device, as well as the granularity of the data displayed |
| 5. Ease of use for mobile appb | Deals with cognitive load of accessing and interpreting the data on the paired mobile app | Includes ease of accessing the different data on the paired mobile app, as well as the granularity of the data displayed |
| 6. Device wearabilitya* | Deals with parameters related to the user experience wearing the device/placing the wearable device upon the user’s body | Includes the size of the device, size of display, and comfort while wearing the device |
| 7. Device water resistancea | Measures the water resistance of the wearable device, rated based on the scale shown in description | 1: Not waterproof or resistant |
| 3: Water-resistant/splash proof | ||
| 5: Waterproof/submersible | ||
| 8. Wearable device batterya | Deals with the battery life of wearable device (T) and is rated using a scale of 1–5 available in description based on evaluator experience with device | 1: T ≤2 days |
| 2: 2 days < T ≤1 week | ||
| 3: 1 week < T <1 month | ||
| 4: 1 month < T <6 months | ||
| 5: 6 months < T | ||
| 9. Device effect on mobile batteryb | Deals with any effect on the mobile phone battery life | Includes information derived from typical use case scenarios for the target population, such as using GPS or not |
| 10. Syncing performancec | Deals with the syncing performance of the device | Includes the max duration without syncing, number of day’s data the device can store, effect of not syncing on the device, ease of syncing device |
| 11. Device aestheticsa* | Deals with overall look and feel of the device, such as modern, or classic, and bulky or slim | Includes subjective assessment of overall aesthetics, in which preferences will likely vary between individual users |
| 12. Device customizationa* | Deals with the different customization options available | Includes available choices for color options, belt clip and strap options. Binary rating |
*, items 2, 6, 11 and 12 were adopted from Motti & Caine (2014); a, applies to wearable device only; b, applies to mobile phone only; c, applies to the interaction of wearable device and mobile phone.